package com.example.forum.service.impl;

import com.example.forum.common.AppResult;
import com.example.forum.common.ResultCode;
import com.example.forum.dao.UserMapper;
import com.example.forum.exception.ApplicationException;
import com.example.forum.model.User;
import com.example.forum.service.IUserService;
import com.example.forum.utils.MD5Util;
import com.example.forum.utils.StringUtil;
import com.example.forum.utils.UUIDUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Date;
import java.util.UUID;

@Slf4j
@Service
public class UserServiceImpl implements IUserService {
    @Resource
    private UserMapper userMapper;

    @Override
    public void createNormalUser(User user) {
        //1、非空校验
        if(user==null|| StringUtil.isEmpty(user.getUsername())||
        StringUtil.isEmpty(user.getNickname())||StringUtil.isEmpty(user.getPassword())||
        StringUtil.isEmpty(user.getSalt())){
            //打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            //抛出异常，统一抛出ApplicationException
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }

        //2、按用户名查询用户信息
        User existsUser= userMapper.selectByUserName(user.getUsername());
        //判断用户是否存在
        if(existsUser!=null){
            log.info(ResultCode.FAILED_USER_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_EXISTS));
        }

        //3、新增用户流程，设置默认值
        user.setGender((byte)2);
        user.setArticleCount(0);
        user.setIsAdmin((byte)0);
        user.setState((byte)0);
        user.setDeleteState((byte)0);
        //当前日期
        Date date=new Date();
        user.setCreateTime(date);
        user.setUpdateTime(date);

        //写入数据库
        int row = userMapper.insertSelective(user);
        if(row!=1){
            log.info(ResultCode.FAILED_CREATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }
        log.info("新增用户成功，username="+user.getUsername());
    }

    @Override
    public User selectByUserName(String username) {
        //非空校验
        if(StringUtil.isEmpty(username)){
            //抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //返回查询结果
        return userMapper.selectByUserName(username);
    }

    @Override
    public User login(String username, String password) {
        //1、非空校验
        if(StringUtil.isEmpty(username)||StringUtil.isEmpty(password)){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));
        }
        //按照用户名查询信息
        User user=selectByUserName(username);
        //对查询结果做非空校验
        if(user==null){
            log.warn(ResultCode.FAILED_LOGIN.toString()+"，username="+username);
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));
        }
        //对密码作校验
        String encryptPassword=MD5Util.md5Salt(password,user.getSalt());
        //用密码和数据库中存储的密码作比较
        if(!encryptPassword.equalsIgnoreCase(user.getPassword())){
            log.warn(ResultCode.FAILED_LOGIN.toString()+"，密码错误，username="+username);
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));
        }
        //登陆成功，返回用户信息
        log.info("登陆成功，username="+username);
        return user;
    }

    @Override
    public User selectById(Long id) {
        if(id==null) {
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_LOGIN));
        }
        User user=userMapper.selectByPrimaryKey(id);
        return user;
    }

    @Override
    public void addOneArticleCountById(Long id) {
        if(id==null||id<=0){
            log.warn(ResultCode.FAILED_BOARD_ARTICLE_COUNT.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_ARTICLE_COUNT));
        }
        //查询用户信息
        User user=userMapper.selectByPrimaryKey(id);
        if(user==null){
            log.warn(ResultCode.ERROR_IS_NULL.toString()+"，user id="+id);
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_IS_NULL));
        }
        //更新用户的发帖数量
        User updateUser=new User();
        updateUser.setId(user.getId());
        updateUser.setArticleCount(user.getArticleCount()+1);
        //更新数据库
        int row=userMapper.updateByPrimaryKeySelective(updateUser);
        if(row != 1){
            log.warn(ResultCode.FAILED.toString()+"，受影响的行数不等于1");
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
    }

    @Override
    public void subArticleCountById(Long id) {
        if(id==null||id<=0){
            log.warn(ResultCode.FAILED_BOARD_ARTICLE_COUNT.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_ARTICLE_COUNT));
        }
        //查询用户信息
        User user=userMapper.selectByPrimaryKey(id);
        if(user==null){
            log.warn(ResultCode.ERROR_IS_NULL.toString()+"，user id="+id);
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_IS_NULL));
        }
        //更新用户发帖数
        User updateUser=new User();
        updateUser.setId(user.getId());
        updateUser.setArticleCount(user.getArticleCount()-1);
        //判断-1后，用户发帖数是否为零
        if(updateUser.getArticleCount()<0){
            updateUser.setArticleCount(0);
        }
        //更新数据库
        int row=userMapper.updateByPrimaryKeySelective(updateUser);
        if(row != 1){
            log.warn(ResultCode.FAILED.toString()+"，受影响的行数不等于1");
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
    }

    @Override
    public void modifyInfo(User user) {
        //1、非空校验
        if(user==null||user.getId()==null||user.getId()<=0){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //2、校验用户是否存在
        User existsUser=userMapper.selectByPrimaryKey(user.getId());
        if(existsUser==null){
            log.warn(ResultCode.FAILED_USER_NOT_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_NOT_EXISTS));
        }
        //3、定义一个标志类
        boolean checkAttr=false;    //false表示没有通过校验
        //4、定义专门用来更新的对象，防止用户传入的User对象设置了其他的属性
        //当使用动态SQL进行更新时，覆盖了没有经过校验的字段
        User updateUser=new User();
        //5、设置用户id
        updateUser.setId(user.getId());
        //6、对每个参数进行校验并赋值
        if(!StringUtil.isEmpty(user.getUsername())&&
                !user.getUsername().equals(existsUser.getUsername())){
            //需要更新用户名时，进行唯一性的校验
            User checkUser=userMapper.selectByUserName(user.getUsername());
            if(checkUser!=null){
                log.warn(ResultCode.FAILED_USER_EXISTS.toString());
                throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_EXISTS));
            }
            //数据库中没有找到相应的用户，表示可以修改用户名
            updateUser.setUsername(user.getUsername());
            //更新标志位
            checkAttr=true;
        }
        //7、校验昵称
        if(!StringUtil.isEmpty(user.getNickname())&&
        !user.getNickname().equals(existsUser.getNickname())){
            //设置昵称
            updateUser.setNickname(user.getNickname());
            //更新标志位
            checkAttr=true;
        }
        //8、校验性别
        if(user.getGender()!=null&&user.getGender()!=existsUser.getGender()){
            //设置性别
            updateUser.setGender(user.getGender());
            //合法性校验
            if(updateUser.getGender()>2||updateUser.getGender()<0){
                updateUser.setGender((byte)2);
            }
            //更新标志位
            checkAttr=true;
        }
        //9、校验邮箱
        if(!StringUtil.isEmpty(user.getEmail())&&
                !user.getEmail().equals(existsUser.getEmail())){
            //设置邮箱
            updateUser.setEmail(user.getEmail());
            //更新标志位
            checkAttr=true;
        }
        //10、校验电话号码
        if(!StringUtil.isEmpty(user.getPhoneNum())&&
                !user.getPhoneNum().equals(existsUser.getPhoneNum())){
            //设置号码
            updateUser.setPhoneNum(user.getPhoneNum());
            //更新标志位
            checkAttr=true;
        }
        //10、校验个人简介
        if(!StringUtil.isEmpty(user.getRemark())&&
                !user.getRemark().equals(existsUser.getRemark())){
            //设置号码
            updateUser.setRemark(user.getRemark());
            //更新标志位
            checkAttr=true;
        }
        //11、根据标志位来决定是否可以执行更新操作
        if(checkAttr==false){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //12、调用DAO
        int row=userMapper.updateByPrimaryKeySelective(updateUser);
        if(row!=1){
            log.warn(ResultCode.FAILED.toString()+"，受影响的行数不等于1");
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
    }

    @Override
    public void modifyPassword(Long id, String newPassword, String oldPassword) {
        //非空校验
        if(id==null||id<=0||StringUtil.isEmpty(newPassword)||StringUtil.isEmpty(oldPassword)){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //查询用户信息
        User user=userMapper.selectByPrimaryKey(id);
        //校验用户是否存在
        if(user==null||user.getDeleteState()==1){
            log.warn(ResultCode.FAILED_USER_NOT_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_NOT_EXISTS));
        }
        //校验老密码是否正确
        //对老密码进行加密，获取密文
        String oldEncryptPassword=MD5Util.md5Salt(oldPassword,user.getSalt());
        //与用户当前密码进行比较
        if(!oldEncryptPassword.equalsIgnoreCase(user.getPassword())){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE ));
        }
        //生成一个新的盐值
        String salt= UUIDUtil.UUID_32();
        //生成新密码的密文
        String encryptPassword=MD5Util.md5Salt(newPassword,salt);
        //构造要更新的对象
        User updateUser=new User();
        updateUser.setId(user.getId());
        updateUser.setSalt(salt);
        updateUser.setPassword(encryptPassword);
        Date date=new Date();
        updateUser.setUpdateTime(date);
        //调用DAO
        int row=userMapper.updateByPrimaryKeySelective(updateUser);
        if(row!=1){
            log.warn(ResultCode.FAILED.toString()+"，受影响的行数不等于1");
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED));
        }
    }
}
